From e527892d89ff14b6af4aad778945c4675423fa77 Mon Sep 17 00:00:00 2001
From: Joshua Salzedo <joshuasalzedo@gmail.com>
Date: Sun, 26 Sep 2021 16:29:22 -0700
Subject: [PATCH] Start work on CRC_v1

---
 embassy-stm32/src/crc/mod.rs |  4 ++++
 embassy-stm32/src/crc/v1.rs  | 21 +++++++++++++++++++++
 embassy-stm32/src/crc/v2.rs  |  0
 embassy-stm32/src/crc/v3.rs  |  0
 embassy-stm32/src/lib.rs     |  2 ++
 5 files changed, 27 insertions(+)
 create mode 100644 embassy-stm32/src/crc/mod.rs
 create mode 100644 embassy-stm32/src/crc/v1.rs
 create mode 100644 embassy-stm32/src/crc/v2.rs
 create mode 100644 embassy-stm32/src/crc/v3.rs

diff --git a/embassy-stm32/src/crc/mod.rs b/embassy-stm32/src/crc/mod.rs
new file mode 100644
index 00000000..79e00be7
--- /dev/null
+++ b/embassy-stm32/src/crc/mod.rs
@@ -0,0 +1,4 @@
+#[cfg_attr(crc_v1, path = "v1.rs")]
+#[cfg_attr(crc_v2, path = "v2.rs")]
+#[cfg_attr(crc_v3, path = "v3.rs")]
+mod _version;
\ No newline at end of file
diff --git a/embassy-stm32/src/crc/v1.rs b/embassy-stm32/src/crc/v1.rs
new file mode 100644
index 00000000..4fc23fe3
--- /dev/null
+++ b/embassy-stm32/src/crc/v1.rs
@@ -0,0 +1,21 @@
+use crate::pac::{CRC as PAC_CRC, RCC};
+use crate::peripherals::CRC;
+use crate::rcc::sealed::RccPeripheral;
+
+pub struct Crc {
+    _peripheral: CRC
+}
+
+impl Crc{
+    pub fn new(peripheral: CRC) -> Self{
+        // enable CRC clock in RCC.
+        CRC::enable();
+        // Reset CRC to default values.
+        CRC::reset();
+        Self { _peripheral: peripheral}
+    }
+
+    pub fn reset() {
+        unsafe { PAC_CRC.cr().modify(|w| w.set_reset(true)) };
+    }
+}
\ No newline at end of file
diff --git a/embassy-stm32/src/crc/v2.rs b/embassy-stm32/src/crc/v2.rs
new file mode 100644
index 00000000..e69de29b
diff --git a/embassy-stm32/src/crc/v3.rs b/embassy-stm32/src/crc/v3.rs
new file mode 100644
index 00000000..e69de29b
diff --git a/embassy-stm32/src/lib.rs b/embassy-stm32/src/lib.rs
index 073e79f2..711c2997 100644
--- a/embassy-stm32/src/lib.rs
+++ b/embassy-stm32/src/lib.rs
@@ -49,6 +49,8 @@ pub mod sdmmc;
 pub mod spi;
 #[cfg(usart)]
 pub mod usart;
+#[cfg(crc)]
+pub mod crc;
 
 #[cfg(feature = "subghz")]
 pub mod subghz;